Trotter wrote:Description: This lavish gift box of Tolkien's seminal works comprises five deluxe slipcased editions - The Hobbit, The Lord of the Rings, The Silmarillion, The Children of Hurin, and Tales from the Perilous Realm. With an individual retail value of GBP340, this quintet represents a saving of GBP90, and only 100 sets have been made.

My mathematics is not very good, I can't reconcile £340-£90=£397.69

The text is from the HC website, where the box was listed at £250 full price - i.e. £90 cheaper than paying £340 for the individual books. Although, as the box appears to have been permanently discounted by 25%, the saving was even bigger.